I'm not an advanced user of POVRay, but I thought only advanced users would
be knowledgeable enough to answer my question.

i want to do refraction where colors are separated, like in the prism
effect.  afaik the feature that does this is photon mapping.  but from a
little bit of reading I get the impression that photon mapping would only
project colors onto surfaces, not onto the camera.  so, e.g. if i created a
diamond i wouldn't see it shine with various colors.

but i had an idea.  let's say I create a white surface, with a lens-shaped
refracting object in front of it, and put a black box around it except for
the lens, like a camera.  then i point this contraption toward the diamond
or whatever, and put the povray camera inside the contraption pointing
toward the white surface.  then of course when the image is rendered I flip
it horizontally and vertically.

will this work?
is it necessary?

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